iridium(0) carbonyl; iridium carbonyl; iridium dodecacarbonyl
|Molar mass||1104.92 g/mol|
|Melting point||195 °C (383 °F; 468 K)|
|Solubility||Chlorocarbons, toluene, tetrahydrofuran|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Tetrairidium dodecacarbonyl is the chemical compound with the formula Ir4(CO)12. This tetrahedral cluster is the most common and most stable "binary" carbonyl of iridium. This air-stable species is only poorly soluble in organic solvents. It has been used to prepare bimetallic clusters and catalysts, e.g. for the water gas shift reaction, and reforming, but these studies are of purely academic interest.
Each Ir center is octahedral, being bonded to 3 other iridium atoms and three terminal CO ligands. Ir4(CO)12 has Td symmetry. The related clusters Rh4(CO)12 and Co4(CO)12 have C3v symmetry because of the presence of three bridging CO ligands in each. It is a homotetranuclear carbonyl cluster containing four Ir-Ir bonds.
- IrCl3 + 3 CO + H2O → [Ir(CO)2Cl2]− + CO2 + 2 H+ + Cl−
- 4 [Ir(CO)2Cl2]− + 6 CO + 2 H2O → Ir4(CO)12 + 2 CO2 + 4 H+ + 8 Cl−
- Pergola, R. D.; Garlaschelli, L.; Matinengo, S. (1990). "Dodecacarbonyltetrairidium: Ir4(CO)12". Inorganic Syntheses. Inorganic Syntheses. New York: J. Wiley & Sons. 28: 245–247. doi:10.1002/9780470132593.ch63. ISBN 0-471-52619-3.